containers/docker: change docker images to go1.9 (#15789)

containers/docker/develop-alpine/Dockerfile

-FROM alpine:3.5
+FROM alpine:3.7
 
 RUN \
   apk add --update go git make gcc musl-dev linux-headers ca-certificates && \

containers/docker/develop-ubuntu/Dockerfile

 FROM ubuntu:xenial
 
+ENV PATH=/usr/lib/go-1.9/bin:$PATH
+
 RUN \
   apt-get update && apt-get upgrade -q -y && \
-  apt-get install -y --no-install-recommends golang git make gcc libc-dev ca-certificates && \
+  apt-get install -y --no-install-recommends golang-1.9 git make gcc libc-dev ca-certificates && \
   git clone --depth 1 https://github.com/ethereum/go-ethereum && \
   (cd go-ethereum && make geth) && \
   cp go-ethereum/build/bin/geth /geth && \
-  apt-get remove -y golang git make gcc libc-dev && apt autoremove -y && apt-get clean && \
+  apt-get remove -y golang-1.9 git make gcc libc-dev && apt autoremove -y && apt-get clean && \
   rm -rf /go-ethereum
 
 EXPOSE 8545

containers/docker/master-alpine/Dockerfile

-FROM alpine:3.5
+FROM alpine:3.7
 
 RUN \
   apk add --update go git make gcc musl-dev linux-headers ca-certificates && \

containers/docker/master-ubuntu/Dockerfile

 FROM ubuntu:xenial
 
+ENV PATH=/usr/lib/go-1.9/bin:$PATH
+
 RUN \
   apt-get update && apt-get upgrade -q -y && \
-  apt-get install -y --no-install-recommends golang git make gcc libc-dev ca-certificates && \
+  apt-get install -y --no-install-recommends golang-1.9 git make gcc libc-dev ca-certificates && \
   git clone --depth 1 --branch release/1.7 https://github.com/ethereum/go-ethereum && \
   (cd go-ethereum && make geth) && \
   cp go-ethereum/build/bin/geth /geth && \
-  apt-get remove -y golang git make gcc libc-dev && apt autoremove -y && apt-get clean && \
+  apt-get remove -y golang-1.9 git make gcc libc-dev && apt autoremove -y && apt-get clean && \
   rm -rf /go-ethereum
 
 EXPOSE 8545